https://www.drupal.org/project/privatemsg/issues/442102
Replace tag checkboxes with autocomplete textfield [#442102] | Drupal.org
Jan 3, 2014 - As discussed.. Replace the checkbox list on the view message page *and* the tag select in the filter widget with an autocomplete textfield. I already did the...
replacetagcheckboxesautocompletetextfield